U.S. patent number 9,344,928 [Application Number 13/824,675] was granted by the patent office on 2016-05-17 for neighbouring cell optimization method and mobile communication system.
This patent grant is currently assigned to ZTE CORPORATION. The grantee listed for this patent is Xiang Cheng, Yin Gao, Meifang He, Lirong Shi. Invention is credited to Xiang Cheng, Yin Gao, Meifang He, Lirong Shi.
United States Patent |
9,344,928 |
Shi , et al. |
May 17, 2016 |
Neighbouring cell optimization method and mobile communication
system
Abstract
The disclosure provides a neighboring cell optimization method
and a mobile communication system, which belong to the
communication field. The method comprises: establishing an IUR
connection between a first Radio Network Controller (RNC) and a
second RNC; after the IUR connection is established successfully,
the first RNC sending neighboring cell information to the second
RNC; and the second RNC performing automatic neighboring cell
optimization according to the neighboring cell information. With
the disclosure, the neighboring cell information between two RNCs
is updated in time, therefore the RNC is enabled to optimize the
neighboring cell in time, and a timely cell handover performed by
User Equipment (UE) is ensured, which provides a basis for ensuring
call continuity of the UE.
Inventors: |
Shi; Lirong (Shenzhen,
CN), Gao; Yin (Shenzhen, CN), Cheng;
Xiang (Shenzhen, CN), He; Meifang (Shenzhen,
CN) |
Applicant: |
Name |
City |
State |
Country |
Type |
Shi; Lirong
Gao; Yin
Cheng; Xiang
He; Meifang |
Shenzhen
Shenzhen
Shenzhen
Shenzhen |
N/A
N/A
N/A
N/A |
CN
CN
CN
CN |
|
|
Assignee: |
ZTE CORPORATION (Shenzhen,
CN)
|
Family
ID: |
44888679 |
Appl.
No.: |
13/824,675 |
Filed: |
March 7, 2011 |
PCT
Filed: |
March 07, 2011 |
PCT No.: |
PCT/CN2011/071585 |
371(c)(1),(2),(4) Date: |
March 18, 2013 |
PCT
Pub. No.: |
WO2011/137682 |
PCT
Pub. Date: |
November 10, 2011 |
Prior Publication Data
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|
|
Document
Identifier |
Publication Date |
|
US 20130183984 A1 |
Jul 18, 2013 |
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Foreign Application Priority Data
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May 5, 2010 [CN] |
|
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2010 1 0177497 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W
36/0061 (20130101); H04W 36/00835 (20180801); H04W
92/22 (20130101) |
Current International
Class: |
H04W
92/22 (20090101); H04W 36/00 (20090101) |
Field of
Search: |
;455/452.2,450 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
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1582054 |
|
Feb 2005 |
|
CN |
|
1878392 |
|
Dec 2006 |
|
CN |
|
101272596 |
|
Sep 2008 |
|
CN |
|
101321355 |
|
Dec 2008 |
|
CN |
|
2009118280 |
|
May 2009 |
|
JP |
|
20050006643 |
|
Jan 2005 |
|
KR |
|
Other References
English abstract of CN101272596A, Sep. 24, 2008. cited by applicant
.
English abstract of CN1582054A, Feb. 16, 2005. cited by applicant
.
English abstract of JP2009118280A, May 28, 2009. cited by applicant
.
English abstract of KR20050006643A, Jan. 17, 2005. cited by
applicant .
English abstract of CN1878392A, Dec. 13, 2006. cited by applicant
.
English abstract of CN101321355A, Dec. 10, 2008. cited by
applicant.
|
Primary Examiner: Eng; George
Assistant Examiner: Dean, Jr.; Joseph
Attorney, Agent or Firm: Porter Wright Morris & Arthur
LLP
Claims
What is claimed is:
1. A neighbouring cell optimization method, comprising:
establishing an IUR connection between a first Radio Network
Controller (RNC) and a second RNC; the first RNC sending
neighbouring cell information to the second RNC after the IUR
connection is established successfully; and the second RNC
performing automatic neighbouring cell optimization according to
the neighbouring cell information; wherein the first RNC sending
the neighbouring cell information to the second RNC after the IUR
connection is established successfully comprises, after the IUR
connection is established successfully, the second RNC sending a
neighbouring cell information request to the first RNC, and the
first RNC sending the neighbouring cell information to the second
RNC according to the neighbouring cell information request; and
further wherein the first RNC sending the neighbouring cell
information to the second RNC according to the neighbouring cell
information request comprises the second RNC sending the
neighbouring cell information request to the first RNC, wherein a
reporting way in the neighbouring cell information request is
periodic reporting, and a period of reporting is a specified length
of time, and after receiving the neighbouring cell information
request, the first RNC sending current neighbouring cell
information to the second RNC, and then periodically sending
neighbouring cell information of a current period to the second RNC
according to the specified length of time.
2. The method according to claim 1, wherein the first RNC sending
the neighbouring cell information to the second RNC after the IUR
connection is established successfully comprises: after the IUR
connection is established successfully, the first RNC sending the
neighbouring cell information to the second RNC actively.
3. The method according to claim 1, further comprising: the second
RNC initiating handover for User Equipment (UE) in a cell according
to an automatically optimized neighbouring cell.
4. The method according to claim 3, wherein the second RNC
initiating the handover for the UE in the cell according to the
automatically optimized neighbouring cell comprises: the second RNC
sending a measurement control message to the UE in the cell,
wherein the measurement control message comprises a neighbouring
list which is updated according to the neighbouring cell
information; the UE performing measurement, and sending, when a
reporting condition is met, a measurement report to the second RNC;
and the second RNC making a decision according to the measurement
report reported by the UE, and instructing the UE to perform
handover according to the decision.
5. The method according to claim 1, wherein establishing the IUR
connection between the first RNC and the second RNC comprises: the
first RNC and the second RNC configuring an IUR interface, and
using the configured IUR interface to establish the IUR connection
between the first RNC and the second RNC.
6. The method according to claim 1, wherein establishing the IUR
connection between the first RNC and the second RNC comprises: the
first RNC sending a measurement control message to UE in a cell of
the first RNC, and the second RNC sending a measurement control
message to UE in a cell of the second RNC; the first RNC obtaining
an IUR interface configured by the second RNC according to a
measurement result returned by the UE in the cell of the first RNC,
and the second RNC obtaining an IUR interface configured by the
first RNC according to a measurement result returned by the UE in
the cell of the second RNC; and the first RNC using the IUR
interface configured by the second RNC and the second RNC using the
IUR interface configured by the first RNC, to establish the IUR
connection between the first RNC and the second RNC.
7. The method according to claim 1, wherein the neighbouring cell
information request sent from the second RNC to the first RNC is an
Information Exchange Initiation Request message or a newly added
neighbouring cell information request message.
8. The method according to claim 1, wherein a message through which
the first RNC sends the neighbouring cell information to the second
RNC according to the neighbouring cell information request is an
existing message or a newly added message, wherein the existing
message is an Information Exchange Initiation Response message, and
the newly added message is a Neighbouring Cell Information Response
message.
9. The method according to claim 1, wherein a requested exchange
type in the neighbouring cell information request is set to cell,
an information type is set to neighbouring cell.
10. The method according to claim 1, wherein a message for sending
the neighbouring cell information comprises the neighbouring cell
information.
11. The method according to claim 1, further comprising: the second
RNC initiating handover for User Equipment (UE) in a cell according
to an automatically optimized neighbouring cell.
12. The method according to claim 1, further comprising: the second
RNC initiating handover for User Equipment (UE) in a cell according
to an automatically optimized neighbouring cell.
13. A mobile communication system, comprising: a first Radio
Network Controller (RNC), which is configured to establish an IUR
connection with a second RNC, and send neighbouring cell
information to the second RNC after the IUR connection is
established successfully; and the second RNC, which is configured
to perform automatic neighbouring cell optimization according to
the neighbouring cell information; wherein the second RNC is
configured to send a neighbouring cell information request to the
first RNC, wherein a reporting way in the neighbouring cell
information request is periodic reporting, and a period of
reporting is a specified length of time; and further wherein the
first RNC is configured such that, after receiving the neighbouring
cell information request, the first RNC sends current neighbouring
cell information to the second RNC, and then periodically sends
neighbouring cell information of a current period to the second RNC
according to the specified length of time.
14. The system according to claim 13, wherein the second RNC
comprises a hardware processor configured to execute the following
modules: a request sending module, which is configured to, after
the IUR connection is established successfully, send a neighbouring
cell information request to the first RNC; and a first information
receiving module, which is configured to receive the neighbouring
cell information returned by the first RNC; the first RNC comprises
a hardware processor configured to execute the following modules: a
request receiving module, which is configured to receive the
neighbouring cell information request sent by the second RNC; and a
first information sending module, which is configured to send the
neighbouring cell information to the second RNC according to the
neighbouring cell information request.
15. The system according to claim 13, wherein the first RNC
comprises a hardware processor configured to execute the following
modules: a second information sending module, which is configured
to, after the IUR connection is established successfully, send the
neighbouring cell information to the second RNC actively; the
second RNC comprises a hardware processor configured to execute the
following modules: a second information receiving module, which is
configured to receive the neighbouring cell information returned by
the first RNC.
16. The system according to claim 13, wherein the second RNC
comprises a hardware processor configured to execute the following
modules: a handover module, which is configured to initiate
handover for User Equipment (UE) in a cell according to an
automatically optimized neighbouring cell.
Description
TECHNICAL FIELD
The disclosure relates to the field of communications, and in
particular to a neighbouring cell optimization method and a mobile
communication system.
BACKGROUND
Ensuring service continuity of a mobile user is a basic function of
a cellular mobile communication system, and handover of a serving
cell of a mobile station is a main means of ensuring the service
continuity. In order to facilitate User Equipment (UE) to perform
the handover, the system needs to configure a neighbouring
relationship for each cell, so that neighbouring cell information
is sent to the UE in a measurement control message, the UE reports
a measurement report, and a network side instructs the UE to
perform the handover.
Which neighbouring cells are around a certain cell is not only
related to a cell distance, but also closely related to a wireless
environment where the cell is. Because the wireless environment is
complicated, it is very difficult to determine exactly which
neighbouring cells should be configured for a certain cell at the
beginning of network planning, especially in a city environment
with dense high buildings. Some other situations will cause that
the neighbouring cell information is not updated in time, for
example, one cell is newly added in the system or an attribute of a
cell changes, but the neighbouring relationship of the cell is not
updated in time, or there is change of environment or omission of a
network planner.
At present, a Radio Network Controller (RNC) transfers the
neighbouring cell information through a response message related to
a radio link on a premise that there is UE moving to another RNC.
If there is missed configuration of a neighbouring cell between two
RNCs, the first UE which moves to another RNC may easily fail in
handing over to another cell in time, which further causes
occurrence of situations, such as an over high load of the current
cell, worsened signal quality of the current cell, serious
interference or call drop of a user. No effective solution has been
presented for the problem that the neighbouring cell information
between two RNCs is not updated in time.
SUMMARY
The disclosure provides a neighbouring cell optimization method and
a mobile communication system, which can at least solve the above
problem.
According to an aspect of the disclosure, a neighbouring cell
optimization method is provided, which comprises: establishing an
IUR connection between a first RNC and a second RNC; the first RNC
sending neighbouring cell information to the second RNC after the
IUR connection is established successfully; and the second RNC
performing automatic neighbouring cell optimization according to
the neighbouring cell information.
Preferably, the first RNC sending the neighbouring cell information
to the second RNC after the IUR connection is established
successfully comprises: after the IUR connection is established
successfully, triggering the second RNC to send a neighbouring cell
information request to the first RNC; and the first RNC sending the
neighbouring cell information to the second RNC according to the
neighbouring cell information request.
Preferably, the first RNC sending the neighbouring cell information
to the second RNC according to the neighbouring cell information
request comprises: the second RNC sending the neighbouring cell
information request to the first RNC, wherein a reporting way in
the neighbouring cell information request is periodic reporting,
and a period of reporting is a specified length of time; and after
receiving the neighbouring cell information request, the first RNC
sending current neighbouring cell information to the second RNC,
and then periodically sending neighbouring cell information of a
current period to the second RNC according to the specified length
of time.
Preferably, the first RNC sending the neighbouring cell information
to the second RNC according to the neighbouring cell information
request comprises: the second RNC sending the neighbouring cell
information request to the first RNC, wherein a reporting way in
the neighbouring cell information request is event based reporting;
and after receiving the neighbouring cell information request, the
first RNC sending current neighbouring cell information to the
second RNC.
Preferably, the first RNC sending the neighbouring cell information
to the second RNC according to the neighbouring cell information
request comprises: the second RNC sending the neighbouring cell
information request to the first RNC, wherein a reporting way in
the neighbouring cell information request is change based
reporting; and after receiving the neighbouring cell information
request, the first RNC sending current neighbouring cell
information to the second RNC, and then sending updated
neighbouring cell information to the second RNC after each update
of neighbouring cell configuration.
Preferably, the first RNC sending the neighbouring cell information
to the second RNC after the IUR connection is established
successfully comprises: after the IUR connection is established
successfully, triggering the first RNC to send the neighbouring
cell information to the second RNC actively.
Preferably, the method further comprises: the second RNC initiating
handover for UE in a cell according to an automatically optimized
neighbouring cell.
Preferably, the second RNC initiating the handover for the UE in
the cell according to the automatically optimized neighbouring cell
comprises: the second RNC sending a measurement control message to
the UE in the cell, wherein the measurement control message
comprises a neighboring list which is updated according to the
neighbouring cell information; the UE performing measurement, and
sending, when a reporting condition is met, a measurement report to
the second RNC; and the second RNC making a decision according to
the measurement report reported by the UE, and instructing the UE
to perform handover according to the decision.
Preferably, establishing the IUR connection between the first RNC
and the second RNC comprises: the first RNC and the second RNC
configuring an IUR interface, and using the configured IUR
interface to establish the IUR connection between the first RNC and
the second RNC.
Preferably, establishing the IUR connection between the first RNC
and the second RNC comprises: the first RNC sending a measurement
control message to UE in a cell of the first RNC, and the second
RNC sending a measurement control message to UE in a cell of the
second RNC; the first RNC obtaining an IUR interface configured by
the second RNC according to a measurement result returned by the UE
in the cell of the first RNC, and the second RNC obtaining an IUR
interface configured by the first RNC according to a measurement
result returned by the UE in the cell of the second RNC; and the
first RNC using the IUR interface configured by the second RNC and
the second RNC using the IUR interface configured by the first RNC,
to establish the IUR connection between the first RNC and the
second RNC.
According to another aspect of the disclosure, a mobile
communication system is provided, comprising: a first RNC, which is
configured to establish an IUR connection with a second RNC, and
send neighbouring cell information to the second RNC after the IUR
connection is established successfully; and the second RNC, which
is configured to perform automatic neighbouring cell optimization
according to the neighbouring cell information.
Preferably, the second RNC comprises: a request sending module,
which is configured to, after the IUR connection is established
successfully, trigger sending of a neighbouring cell information
request to the first RNC; and a first information receiving module,
which is configured to receive the neighbouring cell information
returned by the first RNC; the first RNC comprises: a request
receiving module, which is configured to receive the neighbouring
cell information request sent by the second RNC; and a first
information sending module, which is configured to send the
neighbouring cell information to the second RNC according to the
neighbouring cell information request.
Preferably, the first RNC comprises: a second information sending
module, which is configured to, after the IUR connection is
established successfully, trigger to send the neighbouring cell
information to the second RNC actively; the second RNC comprises: a
second information receiving module, which is configured to receive
the neighbouring cell information returned by the first RNC.
Preferably, the second RNC comprises: a handover module, which is
configured to initiate handover for UE in a cell according to an
automatically optimized neighbouring cell.
With the disclosure, the first RNC provides the neighbouring cell
information to the second RNC after the IUR connection between the
first RNC and the second RNC is established successfully, which
prevents the situation that there is missed configuration of the
neighbouring cell information on the second RNC, solves the problem
that the neighbouring cell information between two RNCs cannot be
updated in time, and provides a basis for ensuring call continuity
of the UE.
BRIEF DESCRIPTION OF THE DRAWINGS
Drawings, provided for further understanding of the disclosure and
forming a part of the specification, are used to explain the
disclosure together with embodiments of the disclosure rather than
to limit the disclosure, wherein:
FIG. 1 shows a flowchart of a neighbouring cell optimization method
according to embodiment 1 of the disclosure;
FIG. 2 shows a flowchart of a method for reporting neighbouring
cell information in a periodic reporting way according to
embodiment 2 of the disclosure;
FIG. 3 shows a flowchart of a method for reporting neighbouring
cell information in an event based reporting way according to
embodiment 3 of the disclosure;
FIG. 4 shows a flowchart of a method for reporting neighbouring
cell information in a change based reporting way according to
embodiment 4 of the disclosure;
FIG. 5 shows a flowchart of a method for actively reporting
neighbouring cell information according to embodiment 5 of the
disclosure;
FIG. 6 shows a flowchart of a method for initiating handover for UE
according to embodiment 6 of the disclosure;
FIG. 7 shows a flowchart of another method for initiating handover
for UE according to embodiment 6 of the disclosure;
FIG. 8 shows a flowchart of a method for establishing an IUR
interface connection according to embodiment 7 of the
disclosure;
FIG. 9 shows a flowchart of another method for establishing an IUR
interface connection according to embodiment 7 of the disclosure;
and
FIG. 10 shows a structural block diagram of a mobile communication
system according to embodiment 8 of the disclosure.
DETAILED DESCRIPTION OF THE EMBODIMENTS
The disclosure is described below with reference to the
accompanying drawings and embodiments in detail. Note that, the
embodiments of the disclosure and the features of the embodiments
can be combined with each other if there is no conflict.
A mobile communication system comprises multiple RNCs and UEs.
There is a wireless connection between each two RNCs and between
the RNC and the UE, and the wireless connection follows the
regulation in a related communication standard. Each embodiment of
the disclosure described below is implemented based on the wireless
communication system.
Embodiment 1
FIG. 1 shows a flowchart of a neighbouring cell optimization method
according to an embodiment of the disclosure, comprising the
following steps.
Step S102: an IUR connection is established between a first radio
network controller (RNC1) and a second radio network controller
(RNC2).
For example, the RNC1 and the RNC2 configure an IUR interface, and
use the configured IUR interface to establish the IUR connection.
The IUR interface is a logic interface between two RNCs and is
configured to transmit control signaling and user data between the
two RNCs.
Step S104: after the IUR connection is established successfully,
the RNC1 sends neighbouring cell information to the RNC2.
For example, after the IUR connection is established successfully,
the RNC2 sends a neighbouring cell information request to the RNC1;
and the RNC1 sends the neighbouring cell information to the RNC2
according to the neighbouring cell information request. The
neighbouring cell information request may be an Information
Exchange Initiation Request message sent by the RNC2 or a newly
added neighbouring cell information request message sent by the
RNC2. The message may comprise the number of requested cells
(RequestedCellNum), for example, assuming that the range of the
number is 1-65535, if RequestedCellNum is set as 65535 (or another
specific value), it is indicated that the neighbouring cells of all
cells of the RNC1 need to be reported.
After the RNC2 is electrified and the IUR connection between the
RNC1 and the RNC2 is established successfully, the RNC2 sends a
request message to the RNC1, or an Operation and Maintenance Center
(OMC) triggers the RNC2 to send the request message to the RNC1, so
as to prevent missed configuration of neighbouring cells.
Step S106: the RNC2 performs automatic neighbouring cell
optimization according to the neighbouring cell information.
The RNC2 in the step may further initiate handover for UE in a
current cell according to an automatically optimized neighbouring
cell, or initiate handover for the UE in the current cell according
to the received neighbouring cell information directly.
The neighbouring cell information transfer between two RNCs in
related technologies is performed on a premise that there is UE
moving to another RNC, but the neighbouring cell information
transfer between two RNCs in the embodiment of the disclosure is
performed after the IUR connection is established successfully and
before any UE performs cell handover. Moreover, the neighbouring
cell information transfer in related technologies is performed
through a response message related to a radio link, but the
neighbouring cell information transfer in the embodiment of the
disclosure is performed without any need of using the response
message related to the radio link, in embodiment of the disclosure,
the neighbouring cell information can be transferred by using an
existing message, for example, Information Exchange Initiation
Response, or by using a newly added message, for example,
Neighbouring Cell Information Response.
In the embodiment, the RNC1 is triggered to provide the
neighbouring cell information to the RNC2 after the IUR connection
between the RNC1 and the RNC2 is established successfully, which
prevents the situation that there is missed configuration of the
neighbouring cell information on the RNC2, solves the problem that
the neighbouring cell information cannot be updated in time between
two RNCs, and provides a basis for ensuring call continuity of the
UE. Moreover, load distribution of a cell is optimized, signal
quality is improved, and user experience is enhanced.
The request message sent to the RNC1 by the RNC2 may comprise a
type of the request, for example, when the type of the request is
neighbouring cell information, it is indicated that the request
message is the neighbouring cell information request. At the same
time, the request message may also comprise a reporting way,
wherein the reporting way comprises periodic reporting, event based
reporting and change based reporting. The RNC1 sends the
neighbouring cell information to the RNC2 through a reporting
message according to the reporting way (periodically reporting or
reporting during update of neighbouring cell configuration). The
three reporting ways will be described below.
Embodiment 2
The embodiment is described by taking the periodic reporting way
for example. With reference to FIG. 2, the method for reporting the
neighbouring cell information in the periodic reporting way
comprises the following steps.
Step S202: the RNC1 and the RNC2 configure an IUR interface office
direction, and a Signaling Connection Control Part (SCCP)
connection between the RNC1 and the RNC2 is established
successfully.
The SCCP (No. 7 signaling) connection is a connection of a radio
network layer and a transport layer. The process of configuring the
IUR interface office direction between two RNCs means the process
that one RNC configures information of the other RNC, such as a
physical identity. The process of establishing the connection is
the process of establishing a physical connection, namely the
physical connection through which the RNCs can communicate with
each other.
Step S204: the RNC2 sends an Information Exchange Initiation
Request message or a newly added Neighbouring Cell Information
Request message to the RNC1.
In the embodiment, a requested exchange type in the request message
is set to cell, an information type is neighbouring cell
information, which indicates that the request message is a
neighbouring cell information request. The RequestedCellNum is set
as 1, and the message comprises an identity of only one cell. The
reporting way is set as periodic reporting, and the period is set
as 24 hours.
Step S206: after receiving the request message, the RNC1 reports
the neighbouring cell information of one cell identified in the
request message. During specific reporting, it is feasible to
report through an existing message, for example, Information
Exchange Initiation Response, or a newly added message, for
example, Neighbouring Cell Information Response.
Step S208: the RNC1 sets a timer, and periodically sends
information report to the RNC2. In the embodiment, the neighbouring
cell information of this cell is reported to the RNC2 every 24
hours through an existing message, for example, Information Report,
or a newly added message, for example, Neighbouring Cell
Information Report.
By periodically reporting the neighbouring cell information of the
specified cell to the opposite RNC, the embodiment can update the
neighbouring cell information of the cell in the opposite RNC in
time and prevent the situation that there is missed neighbouring
cell configuration of the cell, thereby improving the signal
quality of the cell and the performance of the system.
Embodiment 3
The embodiment is described by taking the event based reporting way
for example. With reference to FIG. 3, the method for reporting the
neighbouring cell information in the event based reporting way
comprises the following steps.
Step S302: the RNC1 and the RNC2 configure an IUR interface office
direction, and an SCCP connection between the RNC1 and the RNC2 is
established successfully.
Step S304: the RNC2 sends an Information Exchange Initiation
Request message or a newly added Neighbouring Cell Information
Request message to the RNC1.
In the embodiment, a requested exchange type in the request message
is set to cell, an information type is neighbouring cell, which
indicates that the request message is a neighbouring cell
information request. The RequestedCellNum is set as 5, and the
message comprises identities of five cells. The reporting way is
set as event based reporting.
Step S306: after receiving the request message, the RNC1 reports
the neighbouring cell information corresponding to the five cells
through an existing message, for example, Information Exchange
Initiation Response, or a newly added message, for example,
Neighbouring Cell Information Response.
By reporting the neighbouring cell information of the specified
cells to the opposite RNC in the event based reporting way (namely
reporting after receiving the neighbouring cell information request
each time), the embodiment can update the neighbouring cell
information of the specified cells in the opposite RNC in time and
prevent the situation that there is missed neighbouring cell
configuration of the specified cell, thereby improving the signal
quality of the specified cells and the performance of the
system.
Embodiment 4
The embodiment is described by taking the change based reporting
way for example. With reference to FIG. 4, the method for reporting
the neighbouring cell information in the change based reporting way
comprises the following steps.
Step S402: the RNC1 and the RNC2 configure an IUR interface office
direction, and an SCCP connection between the RNC1 and the RNC2 is
established successfully.
Step S404: the RNC2 sends an Information Exchange Initiation
Request message or a newly added Neighbouring Cell Information
Request message to the RNC1.
In the embodiment, a requested exchange type in the request message
is set to cell, an information type is neighbouring cell, which
indicates that the request message is a neighbouring cell
information request. The RequestedCellNum is set as 65535, and the
message does not need to comprise any cell identity. The reporting
way is set as change based reporting.
Step S406: after receiving the request message, the RNC1 reports
the neighbouring cell information of all cells through an existing
message, for example, Information Exchange Initiation Response, or
a newly added message, for example, Neighbouring Cell Information
Response.
Step S408: when the neighbouring cell information of any cell
changes, the RNC1 reports actively the updated neighbouring cell
information of the cell to the RNC2 through an existing message,
for example, Information Report, or a newly added message, for
example, Neighbouring Cell Information Report; at the same time,
the message comprises the identity of the cell whose neighbouring
cell information changes.
By reporting the neighbouring cell information of the specified
cell to the opposite RNC in the change based reporting way (namely
reporting when there is neighbouring cell information of the cell
changing each time), the embodiment can update the neighbouring
cell information of the specified cell in the opposite RNC in time
and prevent the situation that there is missed neighbouring cell
configuration of the specified cell, thereby improving the signal
quality of the specified cell and the performance of the
system.
Embodiment 5
In the embodiment, the RNC1 sends the neighbouring cell information
to the RNC2 actively. With reference to FIG. 5, the method for
actively reporting neighbouring cell information comprises the
following steps.
Step S502: the RNC1 and the RNC2 configure an IUR interface office
direction, and an SCCP connection between the RNC1 and the RNC2 is
established successfully.
Step S504: the RNC1 sends a neighbouring cell information message
to the RNC2 actively, wherein the message can be a newly added
message, for example, Neighbouring Cell Information Report, or an
existing message, for example, Information Report.
In the step, the reported message comprises the identity of one or
more cells, and the neighbouring cell information corresponding to
each cell. The neighbouring cell information comprises, but not
limited to, the identity of the cell, uplink and downlink carrier
frequency, and Primary Scrambling Code (PSC). The reported message
in the embodiment comprises the neighbouring cell information of
the specified cell in the RNC1, namely the reported message
comprises the identity of the specified cell and the corresponding
neighbouring cell information.
Step S506: when the neighbouring cell information of any cell
changes, the RNC1 sends the updated neighbouring cell information
of the cell to the RNC2 actively; at the same time, the message
comprises the identity of the cell whose neighbouring cell
information changes.
By reporting the neighbouring cell information of the specified
cell to the opposite RNC in the active reporting way, the
embodiment can update the neighbouring cell information of the
specified cell in the opposite RNC in time and prevent the
situation that there is missed neighbouring cell configuration of
the specified cell, thereby improving the signal quality of the
specified cell and the performance of the system.
Embodiment 6
The RNC2 performs corresponding processing after receiving the
neighbouring cell information. For example, the RNC2 performs local
processing and making a decision on whether to update the
neighbouring cell information, and further initiates the handover
for the UE; or the RNC2 may also directly make a decision on
whether to perform handover according to the reported neighbouring
cell. With reference to FIG. 6, the description is based on the
example that the RNC2 initiates handover for the UE after receiving
the neighbouring cell information. The method for initiating
handover for the UE according to the neighbouring cell information
comprises the following steps.
Step S602: after receiving the neighbouring cell information sent
by the RNC1, the RNC2 performs local processing, and makes a
decision on whether to update the neighbouring cell information
maintained by the RNC2.
Step S604: if the neighbouring cell information is updated, when
the RNC2 sends a measurement control message to the UE, the message
comprises an updated neighbouring cell list.
Step S606: the UE performs measurement, and sends a measurement
report to the RNC2 when a reporting condition is met, wherein the
reporting condition may be either a default reporting condition of
the system, or realized by referring to related technologies.
Step S608: the RNC2 makes a decision according to the measurement
report reported by the UE, and instructs the UE to perform handover
according to the decision.
With reference to FIG. 7, the description is based on the example
that the RNC2 initiates handover for the UE after receiving the
neighbouring cell information. The method for initiating handover
for the UE comprises the following steps.
Step S702: after receiving the neighbouring cell information sent
by the RNC1, the RNC2 makes a decision on whether to perform
handover, wherein the specific method for making a decision on
whether to perform the handover can be implemented by using related
technologies, and it will not be described in detail here.
Step S704: if it is decided to perform the handover, the UE is
instructed to perform the handover.
In the embodiment, the RNC2 initiates the handover for the UE in
the cell according to the received neighbouring cell information.
Because the neighbouring cell information is the updated
neighbouring cell information, the situation of missed neighbouring
cell configuration is prevented, thereby enabling the UE to perform
cell handover successfully, and solving the problem of call
drop.
Embodiment 7
The method for establishing an IUR interface connection between two
RNCs in the above embodiments can be implemented by network
planning or measuring and reporting by the UE and other ways. FIG.
8 shows a flowchart of a method for establishing the IUR interface
connection through the network planning according to the embodiment
of the disclosure. In the network planning shown in FIG. 8, three
RNCs are planned in one geographic region, wherein the three RNCs
are respectively RNC1, RNC2 and RNC3, and the UE can perform
handover among these RNCs. The method for establishing the IUR
interface connection comprises the following steps.
Step S802: the RNC1 configures two IUR interfaces, which are
respectively the IUR interface between the RNC1 and the RNC2, and
the IUR interface between the RNC1 and the RNC3. Likewise, the RNC2
also configures the IUR interface between the RNC2 and the RNC1,
and the IUR interface between the RNC2 and the RNC3; and the RNC3
also configures the IUR interface between the RNC3 and the RNC1,
and the IUR interface between the RNC3 and the RNC2.
Step S804: after being electrified successfully, the RNC1, the RNC2
and the RNC3 establish the SCCP connection with the other two RNCs,
respectively.
FIG. 9 shows a flowchart of a method for establishing the IUR
interface connection through measuring and reporting by the UE
according to the embodiment of the disclosure, comprising the
following steps.
Step S902: the RNC sends a measurement control message to require
the UE to perform measurement for cells except monitor set cells
(listed cells to be measured).
The monitor set cells are the cells listed in the measurement
control message; the UE is required to measure the quality of these
cells. However, in the embodiment, the UE is required to measure
the quality of the cells except the listed cells to be measured,
namely inter-frequency cells and/or inter-system cells except the
monitor set cells.
Step S904: the UE reports the measurement result, wherein the
reported message comprises cell information. The cell information
specifically comprises PSC, optional cell identity, optional Public
Land Mobile Network (PLMN) identity, optional Location Area Code
(LAC) and optional Routing Area Code (RAC).
Step S906: the RNC obtains an RNC identity, namely RNC ID, to which
the cell corresponds according to the information reported by the
UE, and then configures the IUR interface office direction, and
establishes the SCCP connection with the RNC.
The embodiment provides two specific ways of establishing the IUR
connection. After the connection is established, the RNC can
transfer the neighbouring cell information by using the method in
the above embodiments, and initiate handover for the UE according
to the received neighbouring cell information. In this way, the
situation of missed neighbouring cell configuration is prevented,
thereby solving the problem of call drop, and improving the
performance of the system.
Embodiment 8
FIG. 10 shows a structural block diagram of a mobile communication
system according to the embodiment of the disclosure. The mobile
communication system comprises: a first RNC12, which is configured
to establish an IUR connection with a second RNC, and send
neighbouring cell information to the second RNC after the IUR
connection is established successfully; and a second RNC14, which
is configured to perform automatic neighbouring cell optimization
according to the neighbouring cell information.
In the embodiment, the first RNC12 is triggered to provide the
neighbouring cell information to the second RNC14 after the IUR
connection between the first RNC12 and the second RNC14 is
established successfully, which prevents the situation that there
is missed configuration of the neighbouring cell information on the
second RNC14, solves the problem that the first UE cannot hand over
to another cell in time when moving to the second RNC14, thereby
load distribution of a cell is optimized, signal quality is
improved, and user experience is enhanced.
After the IUR connection is established successfully, there are two
triggering ways for sending the neighbouring cell information. The
first way is to trigger the second RNC14 to send a neighbouring
cell information request to the first RNC12, so that the first
RNC12 provides the neighbouring cell information. The second way is
to trigger the first RNC12 to provide the neighbouring cell
information to the second RNC14 actively.
For the first way, the second RNC14 comprises: a request sending
module, which is configured to, after the IUR connection is
established successfully, trigger sending of a neighbouring cell
information request to the first RNC12; a first information
receiving module, which is configured to receive the neighbouring
cell information returned by the first RNC12; the first RNC12
comprises: a request receiving module, which is configured to
receive the neighbouring cell information request sent by the
second RNC14; a first information sending module, which is
configured to send the neighbouring cell information to the second
RNC14 according to the neighbouring cell information request.
The neighbouring cell information request sent to the first RNC12
by the second RNC 14 may be a request message. The request message
may comprise a type of the request, for example, when the type of
the request is neighbouring cell information, it is indicated that
the request message is the neighbouring cell information request.
At the same time, the request message may also comprise a reporting
way, wherein the reporting way comprises periodic reporting, event
based reporting and change based reporting. The first RNC12 sends
the neighbouring cell information to the second RNC14 through a
reporting message according to the reporting way (periodically
reporting or reporting during update of neighbouring cell
configuration). The specific way of sending the neighbouring cell
information can refer to the methods in embodiments 2 to 4, and it
will not be described in detail here.
For the second way, the first RNC12 comprises: a second information
sending module, which is configured to, after the IUR connection is
established successfully, trigger active sending of the
neighbouring cell information to the second RNC14; the second RNC14
comprises: a second information receiving module, which is
configured to receive the neighbouring cell information returned by
the first RNC12.
The second RNC14 comprises: a handover module, which is configured
to initiate handover for UE in a cell according to an automatically
optimized neighbouring cell.
The process of establishing the IUR connection between the first
RNC12 and the second RNC14 can be implemented by the method
provided in embodiment 7, so it will not be described in detail
here.
The method that the second RNC14 initiates handover for the UE in
the cell according to the neighbouring cell information can be
implemented by the method provided in embodiment 6, so it will not
be described in detail here.
It can be concluded from the above description that the disclosure
achieves the following technical effects: in the above embodiments,
by triggering sending of the neighbouring cell information after
the IUR connection between two RNCs is established successfully,
the neighbouring cell information between two RNCs is updated in
time, therefore the UE is enabled to perform cell handover in time,
which effectively ensures call continuity of the UE.
Obviously, those skilled in the art shall understand that the
above-mentioned modules and steps of the disclosure can be realized
by using general purpose calculating device, can be integrated in
one calculating device or distributed on a network which consists
of a plurality of calculating devices. Alternatively, the modules
and the steps of the disclosure can be realized by using the
executable program code of the calculating device. Consequently,
they can be stored in the storing device and executed by the
calculating device, or they are made into integrated circuit module
respectively, or a plurality of modules or steps thereof are made
into one integrated circuit module. In this way, the disclosure is
not restricted to any particular hardware and software
combination.
The descriptions above are only the preferable embodiment of the
disclosure, which are not used to restrict the disclosure. For
those skilled in the art, the disclosure may have various changes
and variations. Any amendments, equivalent substitutions,
improvements, etc. within the principle of the disclosure are all
included in the scope of the protection of the disclosure.
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